Femtality- -v0.16.1- By Aerisetta Apr 2026

const count = state(0);

React example (hooks wrapper):

import { state, transition } from 'femtality';

// usage const input = document.querySelector('input'); focusPulse().attach(input); CSS:

// bindText attaches to an element and updates its text content bindText(document.querySelector('#count'), count);

import { useEffect } from 'react'; import { state } from 'femtality';

import { behavior } from 'femtality';

<div id="count">0</div> <button id="inc">+1</button> Behavior: state is shallow, synchronous, and cheap. Effects run after state updates. Use transitions to animate numeric state from A to B.